Frigid Airmass to Bring Significantly Colder Temperatures; Snow Continues Downwind of the Great Lakes

A frigid cold airmass will bring significantly colder weather across the eastern two thirds of the country early this week. Record low temperatures are expected in the Southeast by Tuesday morning. Moderate to heavy lake effect snow will continue downwind of the Great Lakes through Monday. Several inches of snow accumulation is expected, including in portions of the Chicago Metro Read More >

Last Update: 1024 PM EST Sun Nov 9 2025

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Key West, FL Local Forecast Office

5NM E Vaca Cut FL

Marine Zone Forecast

Overnight

Variable winds near 5 knots, becoming west to northwest and increasing to near 10 knots. Seas around 1 foot, building to 1 to 2 feet. Nearshore waters smooth, becoming a light chop. Isolated showers.

Monday

West to northwest winds 10 to 15 knots, becoming northwest to north and increasing to 25 to 30 knots. Seas 1 to 2 feet, building to building to 3 to 5 feet, occasionally to 6 feet. West of cosgrove shoal light, around 2 feet, building to 4 to 6 feet, occasionally to 8 feet. Nearshore waters very rough, increasing extremely rough in the afternoon. Scattered showers.

Monday Night

North winds 25 to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet, except 6 to 9 feet, occasionally to 11 feet west of cosgrove shoal light. Nearshore waters extremely rough.

Tuesday

North to northeast winds 25 to 30 knots, becoming 20 to 25 knots. Seas 4 to 6 feet, occasionally to 9 feet, except 6 to 8 feet, occasionally to 10 feet west of cosgrove shoal light. Nearshore waters extremely rough, becoming very rough.

Tuesday Night

Northeast winds 20 to 25 knots, becoming 15 to 20 knots. Seas subsiding to 2 to 4 feet, occasionally to 5 feet, except subsiding to 4 to 6 feet, occasionally to 8 feet west of cosgrove shoal light. Nearshore waters very rough, becoming choppy.

Wednesday

Northeast to east winds 15 to 20 knots. Seas 2 to 3 feet, except 3 to 5 feet, occasionally to 6 feet west of cosgrove shoal light. Nearshore waters choppy.

Wednesday Night Through Friday Night

Northeast winds near 15 knots. Seas 2 to 3 feet. Nearshore waters a moderate chop.